I would say, if you're not building it to keep for yourself, don't do a BB swap. Find a 360 magnum and build a nice little SB. You WILL lose money on a flip doing a BB swap. Example BB manifolds if you can find them 2 grand, TTI headers 1 grand, most likely aftermarket hood or cut a hole in factory hood, BB motor mounts or front engine plate, then you need a welder. BB oil pan. Pulleys, water pump, distributor. Having someone close to you who has done this swap, priceless.